Membrane Filter Manufacturing via Dynamic Radiation Exposure
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Solution Overview
Problem
Traditional methods for manufacturing membrane filters using alpha-particle exposure have limitations in controlling flow rates and achieving high fineness, resulting in unpredictable performance and limited maximum particle size passage.
Innovation Solution
A system and method involving a radiation source and a collimator to selectively control the angle and uniformity of radiation exposure on a filter substrate, creating uniform and non-intersecting pores, with a controller adjusting radiation flux based on measurements to enhance pore distribution and flow rate predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a static radiation source is used in a batch process for a pre-determined exposure time, then the manufacturing process is simple to operate, but the flow rate control is limited and unpredictable
Solution Approach 1:
The patent transitions from a static batch process to a dynamic continuous process where the radiation source moves continuously relative to the polycarbonate film. This dynamic approach allows real-time control of radiation exposure, enabling precise flow rate control while maintaining operational simplicity through automated motion control.
Solution Approach 2:
The invention changes key process parameters from fixed (static exposure time) to variable (continuous motion speed, radiation intensity). By controlling the speed of the moving radiation source and its intensity, the system can precisely adjust pore density and flow rate characteristics, achieving predictable performance.
2Manufacturing precision
If traditional batch exposure methods are used, then the manufacturing process is straightforward, but the maximum fineness of membrane filters is limited
Solution Approach 1:
The patent introduces motion as a new dimension to the traditionally static exposure process. By moving the radiation source continuously across the film surface, the system creates a time-varying exposure pattern that enables finer pore structures. The motion dimension allows precise control over pore size and distribution that cannot be achieved with static methods.
3Quantity of substance
If longer exposure time is used in batch process, then more pores are created in the film, but the flow rate becomes less predictable and fineness is limited
Solution Approach 1:
The invention replaces discrete batch exposure with continuous radiation exposure during motion. The radiation source continuously irradiates the moving film, ensuring uniform and consistent pore formation throughout the entire film surface. This continuous action eliminates the variability inherent in batch processes, making flow rate highly predictable while achieving desired pore density.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach results in membrane filters with improved fineness and predictable flow rates, enabling higher manufacturing efficiency and customization, while reducing waste and achieving consistent pore uniformity.
Implementation Method 1
exposing a polycarbonate film to alpha-particles, which alter/change the material properties of the portions of the film contacted by the alpha-particles
Implementation Method 2
a collimator disposed between the filter substrate and the radiation source and operative to restrict some of the radiation from contacting the filter substrate
Implementation Method 3
Upon exposure to an etchant, the altered portions are removed from the film, thus leaving small pores which allow particles/molecules to pass through the film
Data Source
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AI summary
A system (10) for manufacturing a membrane filter (12) is provided. The system (10) includes a radiation source (14) operative to emit radiation (16) that contacts discrete portions (22) of a filter substrate (20) so as to facilitate the formation of openings (24) within the filter substrate (20), and a collimator (18) disposed between the filter substrate (20) and the radiation source (14) and operative to restrict some of the radiation (16) from contacting the filter substrate (20).